Power operated cutter



Aug- 10, 1965 v. s. NORTY POWER OPERATED GUTTER Filed Aug. l2. 1963INVENTOR. l/LADIMIR S. NURTY BYcj. O twg lnllllll United States Patent O3,199,193 PGWER QPERATED QUERER Vladimir Norty, i6@ Dewitt St., NewHaven, Conn. Filed Aug. 12, 1953, Ser. No. BllAZl 3 Qiaims. (Cl. Sil-Zil) My invention relates to power operated cutting devices and moreparticularly to power operated devices used for the cutting of cables,rods and the like.

One of the important objects of my invention is to provide a poweroperated cutter which can develop ample force to cut strong cables andbars and which can be operated very conveniently even in confinedquarters where with the customary hand tools the cutting work would bevery diicult and slow, if not impossible.

Another important object of my invention is to provide a power operatedcutter which may be operated equally well by an electric, pneumatic orhydraulic motor and thereby can be easily adapted to particular workingconditions.

A -turther object of my invention is to provide a power operated cuttingtool which is reliable in operation and can be manufacturedeconomically.

Other objects and advantages of my invention will be apparent during thecourse of the following description.

ln the accompanying drawing forming a part of the present application,wherein, for the purpose of illustration is shown a preferred form of myinvention,

FGURE 1 is a longitudinal sectional view of the preferred form of mypower operated cutter,

FGURE 2 is a top view of the cutting blade and the connected plungerscrew,

FlGURE 3 is a cross sectional view taken on the line 3*?) ot FIGURE 1.

Referring to FlG. l of the drawing, the body or frame or" my poweroperated cutter is composed of a tubular rear portion l and a hookshaped front portion 2 provided with a cavity for receiving the objectto be cut, and an internal fixed cutting edge. Part of said frontportion 2 of the body is covered by the cover 3, secured by bolts, andhaving space between them for the disposition of a slidable cuttingblade 5 which, in the form illustrated, has a slanting sharp cuttingedge which may be brought into cutting relation with said fixed cuttingedge of said front portion 2. The alternating sliding motion of thecutting blade 5, necessary for the cutting operation, is accomplished bymeans of the plunger screw il, which is non-rotatable and havings at itsfront end a rectangular head 9, which is secured to said cutting blade5, and is provided with a threaded portion lil adjacent to its rear end.The cutting blade 5 is provided with a rectangular opening 6, adjacentto the rectangular head 9, for the mounting of the front butter spring7, which is secured to said head d. The top view of this assembly of thecuting blade, plunger screw and front butler spring is shown in FIG. 2

The rectangular head 9 and the connected front butler spring 7 areslidable within the passage d, which is formed by two opposing grooves,as shown in FIGB. lt is essential in this invention that the front endor this passage 4 is so located that it engages the spring 7 before theextreme front position of the cutting blade 5 and the connected parts isreached, with the result, that this spring '7 will be compressed in thisextreme front position of the cutting blade and the connected plungerscrew 8.

Mounted within the tubular rear body portion l is the cylindrical sleeve11, which is rotatably supported and axially retained by the ballbearings 12 and 13 and is provided with a drive end 15 to be connectedto a reversible motor 17, which may be electric, pneumatic or hydraulic.The numeral 18 represents the handle of the device.

ltlldd Patented Aug, lil, llid The cylindrical sleeve lll has aninternal threaded portion M designed to cooperate with the threadedportion lo of the plunger screw. Mounted inside the sleeve ll is therear butler spring l, which is so positioned that it is compressed bythe end of the plunger screw d in the extreme rear position of thisscrew and the connected cutter blade 5.

It is essential in this invention that the cooperating threaded portionslll and lll of the screw and the sleeve, respectively, are sodimensioned that in the extreme front position of the screw and theconnected parts the threaded portion lib moves out of engagement withthe threaded portion ld so that the sleeve ll may continue its previousrotation without further advancing the screw and the connected parts.Similarly, in the extreme rear position of the screw and the connectedparts the threaded portion lil moves out of engagement with the threadedportion ld in the opposite direction so that the sleeve may continue itsrotation without further withdrawing the screw and the connected parts.

The operation of my device is as follows: rEhe obiect to be cut isplaced into the hool; shaped cavity against the fixed cutting edge; themovable cutting blade 5 being withdrawn. Then, the reversible motor isstarted to rotate the sleeve il in the direction in which the screw andthe connected cutting blade advance toward the fixed cutting edge. Asthis movement continues the front end of the butter screw '7 willcontact the end of the passage 4, so that the further advance willcompress the spring 7. When the cutter blade 5 and the connected partsreach the extreme front position the threaded portions of the screw andthe sleeve disengage, oerrnitting the sleeve to continue its previousrotation without further advancing the cutter blade and the connectedparts and without overloading the driving motor. The movement of thecutter blade is so designed that in the extreme front position of thecutting lade the cutting operation is completed.

rThe next step is the withdrawal of the cutting blade. This isaccomplished by reversing the rotation or" the driving motor. Due toaxial pressure exerted by the compressed spring 7 at the reversedrotation of the sleeve il the threaded portion lil and l-/l will engagecausing the withdrawal of the cutting blade by the plunger screw 3. Thisrearward motion will continue until the cutting blade and the connectedscrew e" reach the estreme rear position, when the threaded portions llland l:- again disengage preventing a further rearward motion of thecutting blade and the connected parts i-f the motor lcontinue to run.rlhen, the cutting operation being completed the motor may bedeenergized. As in this extreme rear position the rear butler spring lois compressed, the threaded portions and ld will engage automatically assoon as the motor is started in the reverse direction to advance thecutting blade 5 for another cutting operation.

lt is to be understood that the form herein described and illustrated isonly an example of the same, that various changes in the size, shape andin the arrangement of parts may be resorted to, without departing fromthe spirit of my invention or the scope of the subjoined claims.

l. A power operated cutter comprising a body having a hook shaped cavitywith an internal fixed cutting edge; a cut-ting blade slidable withinsaid body in cutting relation with said fixed cutting edge; a plungerscrew attached to said cutting blade and having a threaded portion; afront butler spring secured to the front end of said plunger screw; asleeve rotatable and axially retained within said body and beingoperatively connected to a reversible power driving means, said sleevecontains a of my invention Vree-tion'without further advancing saidscrew and blade,

at opposite direction of rotation of said sleeve,V due to the pressureof said compressed front buier spring said threads engage causing thewithdrawal of said screw and cutting blade until the front thread of thescrew passes the rear thread ot the sleeve and saidrear butter spring iscompressed, in which position the sleeve may continue its rotation inthe same directiony without further withdrawing the screw and blade, andlat another reversal of the rotation of the sleeve, due to the pressureof the contracted rear butter spring, said threads engage so as toadvance the screw and blade toward said fixed cuttingy edge. f

2. A power operated cutter comprising a body'having a hooi; shaped tiredcutting edge; a cutting' lade slidably mounted within said body; aplunger screw secured to said cutting blade and having a threadedportion; a sleeve rotatably mounted in said body retained against axialmovement and having an internal threaded portion for cooperation withthe threaded portion of said screw, said cooperating threads being soadapted that at one direction of rotation of said sleeve said cuttingblade and screw advance toward said fixed cut-ting edge to the extremefront position where the threaded portion of the screwV passes out ofengagement with the threaded portion of said sleeve and at the oppositedirection of rotation of said sleeve said cutting blade and screw arewithdrawn from said cutting edge until they reach the extreme rearposition Where the threaded portion of theV screw passes out ofengagement'with the threaded'portion of said sleeve; a front buer springadapted to be compressed by the advancing plunger `screw in its eX-treme front position exerting axial pressure on said plunger screw forthe engagement of said threaded portions whenthe rotation of said sleeveis reversed; a rear butter springY adapted to be compressed by thewithdrawn plunger screw in its extreme rear position exerting axialpressure on Vsaid plunger screw for the engagementV of said threadedportions when the rotation of said sleeve is eversed; reversible drivingmea-ns with power supply for the rotation of said sleeve.

YEl. A power operated cutter comprising a body; a fixed cutting edge anda movable cutting blade on said body; :a plunger screw secured'to saidcutting blade and having a threadedrportion; a sleeve reversiblyrotatable on said body, retained against. axial movement, and having athreaded portion for cooperation with the threaded portion of saidscrew,` so adapted that, at one direction of rotation of said sleevesaidcutting blade and screw'are advanced'toward said fixed cutting edgeintot'nei'r extreme front position where thethrea-ded portion of thescrew moves out of engagement with the threaded portion of said sleeveand at the opposite direction of rotation of said sleeve said cuttingblade and screw are withdrawn from said fixed cutting edge into theirextreme rear position where the threaded portion of the screw movesoutof engagement with the threaded portion of said sleeve; apair'ofbuiler springs, so adapted that one is compressed in the extremeront position, the other in the extreme rear position of'said plungerscrew, providinrr ressures to facilitate the reen agement yof said`cooperating threaded portions at the reversal of the rotation of saidsleeve; reve-rsible driving means with power supply for the rotation ofsaid sleeve.

`References Cited Aby the Examiner UillTED 'STATES PATENTS 3,178,8164/65 Schmid 30;-228

WILLIAM rnLnMAN, Primary Examinar.

3. A POWER OPERATED CUTTER COMPRISING A BODY; A FIXED CUTTING EDGE AND AMOVABLE CUTTING BLADE ON SAID BODY; A PLUNGER SCREW SECURED TO SAIDCUTTING BLADE AND HAVING A THREADED PORTION; A SLEEVE REVERSIBLYROTATABLE ON SAID BODY, RETAINED AGAINST AXIAL MOVEMENT, AND HAVING ATHREADEDPORTION FOR COOPERATION WITH THE THREADED PORTION OF SAID SCREW,SO ADAPTED THAT, AT ONE DIRECTION OF ROTATION OF SAID SLEEVE SAIDCUTTING BLADE AND SCREW ARE ADVANCED TOWARD SAID FIXED CUTTING EDGE INTOTHEIR EXTREME FRONT POSITION WHERE THE THREADED PORTION OF THE SCREWMOVES OUT OF ENGAGEMENT WITH THE THREADED PORTION OF SAID SLEEVE AND ATTHE OPPOSITE DIRECTION OF ROTATION OF SAID SLEEVE SAID CUTTING BLADE ANDSCREW ARE WITHDRAWN FROM SAID FIXED CUTTING EDGE INTO THEIR EXTREME